文件下载乱码问题

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response.reset();
response.setCharacterEncoding("UTF-8");
String header = request.getHeader("User-Agent").toUpperCase();
if (header.indexOf("FIREFOX") > 0){
fileName = new String(fileName.getBytes("UTF-8"), "ISO8859-1");
} else if (header.indexOf("MSIE") > 0){
fileName = URLEncoder.encode(fileName, "UTF-8");// ie
}
response.addHeader("Content-Disposition", "attachment;filename=" + fileName);
response.setContentType("application/octet-stream");

OutputStream output = new BufferedOutputStream(response.getOutputStream());
byte[] buffer = new byte[1024];
 while(input.available() != 0) {
input.read(buffer);
output.write(buffer);
output.flush();
 }
output.close();
input.close();